Laut Aao Trisha is a finite episode show. But I am not sure how many episodes.
Now almost all the true colours of the family has been revealed and it has also shown how bad a person can become once the situation changes.
So I guess the story is towards its end. (May be or may not be)
But with Trisha coming back and once it is revealed who was keeping her away from her family against her will, I dont think there would be anything left in the story. Ofcourse it depends upon how many episodes they would take to reveal the things and how things would reach at the logical end.
The new show which is starting on 17th November could also be replacing some other show or it might get a new timing.